## Epidemiology of Enteric Fever in India **Key Point:** Salmonella typhi is responsible for approximately 80–90% of enteric fever cases in India, while Salmonella paratyphi A accounts for most of the remaining cases. ### Geographic Distribution - **S. typhi**: Predominant in South Asia (India, Pakistan, Bangladesh), Africa, and Southeast Asia - **S. paratyphi A**: Emerging pathogen in India; increasing prevalence in urban areas over the past two decades - **S. paratyphi B**: Rare in India; more common in developed nations - **S. enteritidis**: Causes gastroenteritis, not enteric fever ### Clinical Significance - S. typhi infections are associated with higher rates of complications (intestinal perforation, myocarditis) - S. paratyphi A typically causes milder disease with lower mortality - Antibiotic resistance patterns differ: S. typhi shows higher rates of fluoroquinolone resistance in India **High-Yield:** In NEET PG, any question on enteric fever epidemiology in India defaults to S. typhi unless the stem specifies paratyphoid or mentions resistance patterns. **Clinical Pearl:** The rise of S. paratyphi A in urban India is thought to be linked to improved sanitation reducing S. typhi transmission, allowing S. paratyphi A to fill the niche.
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